ADTRAN DSU IV ESP, User Manual

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Chapter 13. Testing and Troubleshooting
61204011L1-1 DSU IV ESP User Manual 13-7
Test Sequence for Troubleshooting New Installs or Existing Circuits
If your DSU... Do this...
seems to be having problems Perform a self-test to determine whether the unit is
operational.
is receiving excessive errors
requiring retransmission of
data, First perform a DTE with Test Pattern to determine
whether the unit's internal transmitter and receiver are
operating error free.
If problem persists, perform a Remote Test to verify
the connection between the local and remote unit is
error free.
Run the test using all available test patterns.
fails any of these tests or the
problem has not been deter-
mined, Contact ADTRAN Technical Support. This informa-
tion is located in the front section of this manual.
If an external BERT tester is available, these additional tests may be per-
formed: DTE & Loop Test, DTE Only Test, Loop Only Test.